Four policemen killed transporting bomb in Colombia
Four Colombian police officers were killed Saturday while trying to move a bomb, which had been part of Thursday's failed assassination attempt against a city mayor by leftist rebels, said local police.

The bomb, found by officers before dawn Saturday, was hidden in a water meter in front of a radio station building in the city of Neiva, about 300 km south of the capital Bogota.

The bomb exploded in downtown Neiva while being transported in a police vehicle, killing four officers.

The bomb was part of Thursday's failed attack against mayor Cielo Gonzalez by the Revolutionary Armed Forces of Colombia (FARC), the largest rebel group in Colombia.

The first device to go off was a car bomb left outside a radio station where she was making a broadcast.

She was giving a regular weekly interview when security officers noticed a suspicious car abandoned outside and ordered it to be removed. The car exploded as it was being towed away, injuring eight people.

Local police said they were looking for a possible third device.

Neiva has long been plagued by violence because of its location in the heart of Colombia's impoverished south, a major FARC stronghold. Gonzalez has been the target of at least two other assassination attempts since 2003.

The FARC, the largest Colombian guerrilla group, has been fighting the government since the mid-1960s. The group is reported to have some 20,000 fighters.